Seperate Battery options for EVs

A recent study found that EV drivers would like to get 150 miles per charge. Right now the cost of batteries capable of getting that far may be too expensive for some but not for everyone. I own a Focus Electric and would easily have paid 10k more for double the range. Just design the car so that it can accommodate say 3 sizes of battery, with a price increase for each step. That way the budget constrained can get the smallest while those who can afford more, get more range.